I'll bet you don't spend a ton of time thinking about Deimos, the smaller of the two Martian moons, which is named after the Ancient Greek god that personified dread. And who could blame you?

It's called Deimos, and is much smaller and more mysterious than Phobos, the first moon of Mars. The pictures were taken by the ESA's Hera mission, which is on its way to an asteroid called ...